For a while I've been meaning to do a comparison between a Micro 4/3 camera and one with a state-of-the-art APS-C sensor, using lenses of the same focal length and cropping the APS-C image down to equalise the framing. To do this test I have used an Olympus E-M1 and a Samsung NX500. When cropped down to match the framing and aspect ratio of a Micro 4/3 camera, the resolution of the NX500 image is approximately 20mp (down from 28mp). The purpose of this was to see whether there would be a tangible benefit by creating a Micro 4/3 sensor using the latest in technology. This is how the two sensors compare by numbers alone: Source: Samsung NX500 vs Olympus OM-D E-M1 | DxOMark Now keep in mind that by cropping the Samsung sensor it will automatically have a smaller dynamic range and it's low light noise threshold will be reduced, since the noise generated per pixel doesn't change but there are less pixels overall for the noise to hide in. What that means is that a Micro 4/3 sized version of the Samsung sensor wouldn't score as highly as the full sized version does. My test was to take an image of a high dynamic range scene with each camera at their base ISO; 100 for the NX500 and 200 for the E-M1. While the E-M1 does have a simulated ISO 100 (LOW) setting, this is just an overexposed ISO 200 image that has been pulled back by one stop that gives less shadow noise but also less highlight dynamic range. If I was to use the LOW setting on the E-M1 it could be argued that I could do the same thing manually with the Samsung to create a simulated ISO 50 setting. The lenses used in this test were the 20mm f1.7 pancake on the E-M1 and the 20mm f2.8 pancake on the NX500. E-M1 unedited E-M1 edited NX500 edited and cropped to match framing. Comparisons of 100% crops at various locations For me the difference comes down to the E-M1 having more shadow noise, and of course the slightly higher resolution of the Samsung even when cropped. In this case I feel that the key advantage enjoyed by the Samsung comes from it having a lower base ISO. My second test was performed in low light at ISO 6400 using each manufacturer's respective 45mm f1.8 lens. E-M1 NX500 Comparison of 100% crops Again I think that this a small win to the cropped NX500 sensor, most obviously with less colour bleeding into the blacks. I apologise if this wasn't the most exhaustive comparison but it has been enough to show me that there would be a small benefit to applying the latest in sensor technology to Micro 4/3 cameras. Maybe Olympus could buy up the remaining stock of NX1/NX500 sensors and file them down to size .